Medical Manual of Defence Against Chemical Agents (extracts from the official United Kingdom military and civil defence manual, 1972).
This manual contains a chapter on decontaminating food and also provides an essential differential diagnosis chart which allows the exact nerve gas to be deduced from the symptoms of patients which otherwise will be confused (some cause similar symptoms), Table V:
"Summary of Clinical Effects of Chemical Agents and their Differential Diagnosis".
This is useful in relation to the use of sarin bombs and chlorine barrels, gases both being used in the on-going Syrian Civil War, allowing a quick and straightforward diagnosis of which chemical is used in any attack, so that the casualties can immediately be given valid treatment. (Sending samples away for analysis is generally far too slow, taking days.)